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      1 // run
      2 
      3 // Copyright 2016 The Go Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style
      5 // license that can be found in the LICENSE file.
      6 
      7 // Test that an interface conversion error panics with an "interface
      8 // conversion" run-time error. It was (incorrectly) panicking with a
      9 // "nil pointer dereference."
     10 
     11 package main
     12 
     13 import (
     14 	"fmt"
     15 	"runtime"
     16 	"strings"
     17 )
     18 
     19 type I interface {
     20 	Get() int
     21 }
     22 
     23 func main() {
     24 	defer func() {
     25 		r := recover()
     26 		if r == nil {
     27 			panic("expected panic")
     28 		}
     29 		re, ok := r.(runtime.Error)
     30 		if !ok {
     31 			panic(fmt.Sprintf("got %T, expected runtime.Error", r))
     32 		}
     33 		if !strings.Contains(re.Error(), "interface conversion") {
     34 			panic(fmt.Sprintf("got %q, expected interface conversion error", re.Error()))
     35 		}
     36 	}()
     37 	e := (interface{})(0)
     38 	if _, ok := e.(I); ok {
     39 		panic("unexpected interface conversion success")
     40 	}
     41 	fmt.Println(e.(I))
     42 	panic("unexpected interface conversion success")
     43 }
     44